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30 November 1998 <br /> AGE-NC Project No. 98-0520 <br /> ' Page 8 of 9 <br /> ' sediment from inside the well, surging to flush out or draw in sediment from the filter pack, and <br /> additional bailing to finish the removal of sediment. Development activities will be continued until <br /> field parameter (pH, electrical conductivity, and temperature) readings have stabilized. <br /> 3.6. GROUNDWATER SAMPLING PROCEDURES <br /> Groundwater sample collection will be,performed in accordance-with pertinent applicable sampling <br /> protocols, details of which are presented below. <br /> 3.6.1. Static Water Level Measurements <br /> 1 <br /> Before sampling and during quarterly groundwater monitoring, static water level will be measured <br /> ' using an electric water level indicator. Water level data will be recorded to the nearest 0.01 foot <br /> from a reference point marked of the top of the PVC well casing. Before and after each use, the <br /> measurement device will be rinsed with water. <br /> 3.6.2. Well Evacuation <br /> ' Subsequent to measurement of depth to water and prior to sampling, the well will be purged usin <br /> g <br /> a disposable bailer to ensure that the sample is representative of the formation, rather than water { <br /> ' standing in the well casing. The well will be purged until: 1) a minimum of three casing volumes is <br /> removed from the well; and 2) the field-measured ground water parameters have stabilized. <br /> However, a well is purged dry prior to evacuating three casing volumes, a ground water sample will <br /> ' be collected following 80 percent recovery of ground water within the well or within 8-hours of well <br /> evacuation. <br /> 1 <br /> 3.6.3. Sample Withdrawal <br /> ' Water samples will be collected from the monitoring well using a disposable polyethylene bailer. <br /> These bailers are disposed of after one use and require no decontaminating, therefore minimizing <br /> ' cross contamination-due to sampling devices. Samples will be drawn and collected in such a manner <br /> that agitation and exposure of the groundwater to the atmosphere is minimal. Sample containers will <br /> be filled using the appropriate disposable sampling attachment which allows controlled flow out of <br /> ' the bottom of the bailer by lifting up on the check valve. <br /> 1 <br /> Advanced GeoEnvironnientaf,Inc. <br /> 1 <br />